Editorial. Preface; R.S. Berry. Part I: Some Fundamental Questions in Non-Rigid Molecular Problems. The Structure, Symmetry, and Properties of Non-Rigid Molecules; A.I. Boldyrev. Do We Really Know How to Define Normal Vibrations in Non-Rigid Molecular Systems? G.A. Natanson. Generalizing the Molecular Symmetry Group of Longuet-Higgins to Asymmetric Tunneling Problems; R.G.A. Bone. Part II: Structure and Symmetry of Non-Rigid Molecular Systems. Characterization of Rotational Isomerization Processes in Monorotor Molecules; G.I. Cárdenas-Jirón, A. Toro-Labbé, C.W. Bock, J. Maruani. Group Theory for Three-Dimensional Non-Rigid Molecular Problems. Applications to the Double C3v Rotation, plus Bending, Wagging or Torsion Mode; Y.G. Smeyers. Non-Rigidity in Heptacoordinate Complexes; J. Brocas. Jet-Cooled Fluorescence Excitation Spectra and Carbonyl Wagging Potential Energy Functions of Cyclic Ketones in their Electronic Excited States; J. Lanne, J. Zhang, W.-Y. Chiang, P. Sagear, P. Cheatham. Part II: Dynamics of Non-Rigid Molecular Systems. Photofragmentation Dynamics of van der Waals Complexes; G. Delgado-Barrio, J.A. Beswick. Dynamics of Non-Rigid Molecules: Explorations of the Phase Space; D.E. Weeks, R.D. Levine. Index.
